/*
 * Copyright (c) 2024 Oracle and/or its affiliates.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package io.helidon.service.registry;

import java.util.Optional;
import java.util.ServiceLoader;

import io.helidon.common.HelidonServiceLoader;
import io.helidon.common.LazyValue;
import io.helidon.service.registry.spi.ServiceRegistryManagerProvider;

final class ServiceRegistryManagerDiscovery {
    private static final Optional<ServiceRegistryManagerProvider> REGISTRY_MANAGER_PROVIDER =
            HelidonServiceLoader.builder(ServiceLoader.load(ServiceRegistryManagerProvider.class))
                    .build()
                    .stream()
                    .findFirst();

    private ServiceRegistryManagerDiscovery() {
    }

    static ServiceRegistryManager create(ServiceRegistryConfig config) {
        ServiceDiscovery discovery = config.discoverServices() || config.discoverServicesFromServiceLoader()
                ? CoreServiceDiscovery.create(config)
                : CoreServiceDiscovery.noop();

        LazyValue<ServiceRegistryManager> coreManager = LazyValue.create(() -> new CoreServiceRegistryManager(config, discovery));

        return REGISTRY_MANAGER_PROVIDER.map(it -> it.create(config, discovery, coreManager))
                .orElseGet(coreManager);
    }
}
